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United States Patent | 5,110,258 |
Morinushi ,   et al. | May 5, 1992 |
A blower comprises an impeller which can function to raise the pressure of a fluid and delivers it; a driving device for driving the impeller; and a fan casing which includes a fluid path to inspire the fluid from the outside and deliver it to the outside through the impeller; wherein the fan casing is at least partly formed by a hard porous structural unit whose specific gravity is continuously changed in at least one of the direction of thickness and a direction of surface.
Inventors: | Morinushi; Ken (Amagasaki, JP); Tanaka; Hideharu (Amagasaki, JP); Noguchi; Yoshihiro (Hanazono, JP); Imai; Toshihisa (Hanazono, JP); Takahashi; Yutaka (Hanazono, JP) |
Assignee: | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP); Mitsubishi Electric Home Appliance Co., Ltd. (Saitama, JP) |
Appl. No.: | 561685 |
Filed: | August 2, 1990 |
Aug 09, 1989[JP] | 1-204881 |
Current U.S. Class: | 415/119; 181/224; 181/225 |
Intern'l Class: | F01D 005/10 |
Field of Search: | 181/224,225,282 415/119,200 |
3485443 | Dec., 1969 | Earhart. | |
3540547 | Nov., 1970 | Coward. | |
3709774 | Jan., 1973 | Kimura. | |
3718532 | Feb., 1973 | Hayes, Jr. | 161/159. |
3890060 | Jun., 1975 | Lipstien. | |
3947148 | Mar., 1976 | Holt | 181/225. |
4234291 | Nov., 1980 | Hurst et al. | 415/200. |
4296831 | Oct., 1981 | Bennett | 181/224. |
4807718 | Feb., 1989 | Lotz | 181/225. |
Foreign Patent Documents | |||
601856 | Aug., 1934 | DE2. | |
1095504 | Dec., 1960 | DE | 181/224. |
7603995 | Jun., 1970 | DE. | |
639492 | Jun., 1928 | FR | 181/224. |
61-114000 | Jul., 1986 | JP. | |
61-192898 | Aug., 1986 | JP. | |
1333861 | Aug., 1987 | SU | 415/119. |
967100 | Aug., 1964 | GB | 415/119. |